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03-03-2014, 08:25 PM
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#1
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Senior Member
Join Date: Jun 2003
Location: Houston,Tx,USA
Posts: 285
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C-9 Check Engine Light
A friend keeps getting an intermittent check engine light with his Cat C-9 engine. Is there anyone here that has a list of the items that can cause the check engine light? We'd like to be able to review the list and maybe eliminate the items one at a time until we can determine what's causing the light. Thanks for any info!
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Currently motorhomeless
A mutt named Arvee
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03-04-2014, 03:35 AM
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#2
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Senior Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Jul 2012
Location: Where the Rig is Parked
Posts: 1,393
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Could be a little low on coolant. Our Winnebago will do that when it is a little low and I come to a stop.
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03-04-2014, 09:22 PM
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#3
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Senior Member
Join Date: Nov 2009
Location: Warren, Oregon
Posts: 2,559
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As stated coolant level and clean the batteries always a good place to start.
2 stroker
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2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mounting
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One
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03-05-2014, 08:26 PM
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#4
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Senior Member
National RV Owners Club Freightliner Owners Club
Join Date: Oct 2002
Location: silverdale wa.
Posts: 1,163
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Another thing would be a low oil level or low oil pressure. The former can be caused stopping quickly or stopping going down a hill and the oil runs to the front of the engine. The latter can also be caused be a sudden lift of the foot and the oil pressure drops rapidly.
I would suggest that you get it into a CAT mechanic so that the codes can be read.
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Bigdog
2001 National Tradewinds 7390 LTC
2002 Subaru Legacy outback Limited stick
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03-07-2014, 11:14 AM
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#5
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Senior Member
Monaco Owners Club
Join Date: Aug 2007
Location: Gardnerville, Nevada
Posts: 1,336
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If you can get a code for the check engine light try this web site, it gives codes for C7 and C9:
http://www.sbsales.com/docs/cat_engine_codes.pdf
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Ken, Chris and Maverick (Golden Retriever)
2009 Beaver Contessa
1984 LS1 CJ7 & 2017 Yamaha YXZ SS SE
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03-07-2014, 01:24 PM
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#6
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Senior Member
Join Date: Jun 2003
Location: Houston,Tx,USA
Posts: 285
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Thank you all for your help. My buddy was able to get the failure code from his diagnostics panel and called Spartan. They say the code is for the coolant level sensor.....he ordered a replacement from Spartan. Thank you all once again!!
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Currently motorhomeless
A mutt named Arvee
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03-07-2014, 02:03 PM
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#7
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Senior Member
Join Date: May 2013
Posts: 962
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I would hope my medallion would indicate low coolant VS. a check engine obscure message. That is a lot of work to determine you are low on coolant (or need a sensor).
Chris
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American Revolution 40L CAT C9
Samsung 197, TireMinder, Ready Brute Elite with Wrangler
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03-07-2014, 05:40 PM
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#8
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Senior Member
Join Date: Jun 2003
Location: Houston,Tx,USA
Posts: 285
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True, you'd think there would be an icon for low coolant level on the display panel.....check engine light does seem a bit drastic for only low coolant level. To be honest, I don't know if I have a low coolant level light on my display or not, never seen it and have never looked.....
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Currently motorhomeless
A mutt named Arvee
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06-29-2014, 11:09 AM
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#9
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Senior Member
Join Date: May 2013
Posts: 248
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hi
i have a c7 2005 with same problem and after a year finally found a good tech who fixed it with no help from freightliner,my engine lite came on and went off and all along the guages were all normal and the engine remained normal.
problem was that my boost pressure was overpressuring from the exhaust turbo.on mine it should be 25 psi but it was up to 29 psi when driving which turned on my engine lite from the exhaust sensor valve which is mounted on top of engine takes 10 minutes to change and is$350.00.first make sure your air filter and fuel filter is good,to test this you need a tech with a laptop and PROPER PROGRAMMING for your engine.if that doesn't work check out your j1939 to make sure there is no wiring problem,and that can be checked with simple ohmn test through your plug in at the motor,do this before replacing expensive parts
good luck if you need further info no problem
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06-29-2014, 11:14 AM
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#10
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Senior Member
Join Date: May 2013
Posts: 248
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your boost pressure is to high
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08-22-2014, 04:51 PM
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#11
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Junior Member
Join Date: Jan 2013
Posts: 1
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I have a 2008 C9 Cat and about 3 years ago Cat replaced the complete exhaust system as ours was on a recall from Cat. The system the installed was a complete different system than was originally in the coach. This new system is now causing the check engine light to come on as it has a radiator in it which is leaking water into the regeneration system. This moisture is causing the sensors to not function properly and also I am being told there is a carbon particullit filter which will have to be cleaned if it has too much back pressure. This is what I am told by the Cat dealer tech that is working on it. There estimate is 8 to 10 hours of labor with an estimate of $1000 for the radiator plus the cleaning of the pariculite filter if that is necessary. The general estimate is $2000 to $2500 to have this done. My motor is a C9 Cat 425 hp with 60,000 miles. I believe Cat should bear some of the costs of this as it was replacement obviously for an item that did not work and only has approximately 20,000 miles on it. Has anyone else had a similar problem?
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08-22-2014, 07:32 PM
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#12
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Senior Member
Join Date: Mar 2006
Location: Full Time USA
Posts: 2,216
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Something else to think about as well as check. The "surge tank" on top of the radiator, Rear mounted radiators the sun beats onto these "white plastic" tanks that are NOT UV resistant. I noticed the seam between top/bottom half starting to separate. Take your fingernail & scratch the side of the tank. Mine left a deep grove! If you have some good buddies on the Freightliner parts counter your looking at about $120 for a new tank. ALSO, inspect that radiator cap as well for good seal against the rubber.
I might paint my new tank black B4 installing. I'll post the complete replacement process.
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Robert & Deb
07 Discovery 39v FWS Full Timers, Henniker NH
1K solar - 05 Jeep Grand Cherokee
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08-24-2014, 10:32 AM
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#13
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Senior Member
Join Date: May 2013
Posts: 248
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HI
HAD THIS PROBLEM WITH MY C7 2005
AFTER MANY WRONG DIAGNOSIS ONE YEAR LATER FOUND THE RIGHT MECHANIC
PROBLEM WAS IT WAS OVER BOOSTING THROUGH THE TURBO WHICH OPERATES GATE VALVE NOW THE SENSOR VALVE SHOULD OPEN AT 25 PSI AND MINE WAS A FEW LBS MORE WHICH IN TURN TURNED MY BUZZER AND STOP ENGINE LITE ON FROM OVER BOOSTING,CHANGED THE SENSOR VALVE LOCATED ON TOP OF ENGINE EVRTHING IS FINE IT'S APPROX $150 ON YOUR BIGGER ENGINE YOUR BOOST MIGHT BE ALITTLE HIGHER.GOOD LUCK EMAIL IF YOU LIKE AT rolandh@mts.net
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